Arbor



FIG. 1 is a perspective view of an arbor, showing my new design;

FIG. 2 is a front elevational view thereof, the rear view being a mirrorimage;

FIG. 3 is a side elevational view thereof, the other side being a mirrorimage;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

The ornamental design for an arbor, as shown and described.